What is the regulated basis for custody arrangements in a digital-asset fund?
Custody of digital assets held by an institutional fund is a regulated activity in every flagship fund domicile, and the applicable regime determines who may act as custodian, what segregation standards apply and how liability sits between the fund, its manager and the custodian. For an institutional crypto fund (a collective investment vehicle investing predominantly in virtual assets on behalf of professional or qualified investors), that analysis begins at domicile selection and runs through every material counterparty in the structure. Getting it wrong at formation locks in both structural and tax inefficiency that is costly to unwind.
The cross-border dimension compounds the issue immediately. A Cayman-domiciled fund managed by a team in the UAE, banking in a European institution and investing in assets held on exchanges in Singapore faces at least four regulatory perimeters simultaneously. Custody sits at the intersection of all of them. The VARA regime in Dubai, the MAS Payment Services Act regime in Singapore and the FSRA framework in Abu Dhabi each impose their own safeguarding and segregation requirements on licensed custodians operating within their perimeters. A custodian arrangement that is compliant in one forum may not satisfy the requirements of another where the fund's assets actually sit.
In our practice, the custody architecture question is the first structural decision we work through with fund clients – before the choice of administrator, before the subscription mechanics and, often, before the final domicile is fixed.
Who needs institutional-grade custody arrangements, and why does the category matter?
Institutional-grade custody is required by any fund accepting commitments from regulated investors – pension funds, insurance companies, family offices operating under a regulated mandate and sovereign wealth vehicles – because those investors' own compliance obligations require them to confirm that assets are held in a regulated custody arrangement meeting defined segregation and safeguarding standards.
The distinction matters practically. A fund manager who structures custody informally – using an exchange account, a multi-sig arrangement held in-house or a technology-only solution that is not a regulated custodian – will be unable to pass the institutional due-diligence process. That is not a theoretical risk. We have seen fund managers lose anchor investor commitments at the final documentation stage because the custody arrangement could not be confirmed as regulated in the relevant jurisdiction. The opportunity cost is direct and immediate.
The definition of "institutional client" also varies by regime. MiCA and the relevant EU/EEA national frameworks distinguish between professional clients and eligible counterparties in a manner that affects both the obligations imposed on the fund and the protections available to investors. Under the FSRA framework, the classification of an investor as a "market counterparty" or a "business client" changes the applicable conduct of business rules for the custodian. These distinctions are not administrative formalities – they determine the entire contractual and regulatory structure of the custody relationship.
How does fund domicile interact with custody structure?
The domicile of the fund vehicle determines which custodian regime applies as a baseline and which custodian pool is practically available. Not every regulated custodian is licensed in every domicile, and institutional investors increasingly require that the custodian be regulated in a jurisdiction they recognise – typically the Cayman Islands, the BVI, Ireland, Luxembourg or a leading common-law financial centre.
Cayman domicile under CIMA supervision is the most common choice for USD-denominated institutional digital-asset funds targeting US-adjacent family offices and endowments. The BVI, under the BVI FSC and the VASP Act 2022, offers a lighter-touch option that suits smaller vehicles, though some institutional investors apply heightened scrutiny to BVI-domiciled structures. ADGM, regulated by the FSRA, has become a credible alternative for managers targeting Middle Eastern allocators, and AIFC in Kazakhstan under the AFSA serves managers seeking access to regional institutional capital in Central Asia and adjacent markets.
The practical consequence is that domicile and custodian selection are co-dependent decisions. A manager who selects a domicile without mapping the available regulated custodian pool in that jurisdiction, or without confirming that its target custodian holds the required licence in that domicile, may find itself reconstituting the structure before first close.
Tax treatment adds another layer. The domicile affects whether the fund is transparent or opaque for the tax purposes of its investors, whether withholding tax applies to redemption proceeds and whether the fund's own gains on digital-asset disposals are sheltered or exposed. We match domicile to investor base, asset mix and redemption profile precisely because a mismatch at any of these points creates leakage that compounds across the fund's life.
For a scoped assessment of your fund's domicile and custody structure, contact OBOLUS at info@oboluslaw.com. The process above describes the standard analytical path. Your facts – the investor base, the asset mix, the manager's own regulatory perimeter – change the analysis materially.
What custody models are available for digital-asset funds?
Institutional digital-asset funds use one of three broad custody models, each with distinct regulatory implications, counterparty risk profiles and operational requirements.
The first model is a qualified custodian arrangement, in which a regulated financial institution licensed to provide custody of digital assets holds the fund's assets in segregated accounts, maintains the private keys and provides the fund with a contractual and regulatory safe harbour. This model satisfies the most demanding institutional due-diligence requirements and is the default expectation for funds targeting US-regulated investors, European pension allocators or sovereign wealth mandates. The regulated custodian pool for digital assets remains smaller than for traditional assets, and the cost structure reflects that scarcity.
The second model is a prime broker / sub-custodian structure, in which a digital-asset prime broker holds assets operationally on behalf of the fund while a top-level custodian maintains the formal custody relationship. This model is common for funds that require active trading across multiple venues, because it allows margin, lending and exchange connectivity that a pure qualified custodian arrangement typically does not. The legal complexity is higher: the fund's counsel must map the custodial chain carefully to ensure that segregation, insolvency protections and liability allocation survive at every tier.
The third model is a self-custody with institutional controls arrangement, using hardware security modules (HSMs), multi-party computation (MPC) key management and independent oversight. This model is adopted by some larger managers who have concluded that counterparty risk at regulated custodians exceeds the regulatory risk of self-custody. It rarely satisfies the due-diligence requirements of regulated institutional investors without supplementary opinion letters and third-party attestations, and it carries significant operational and legal liability exposure for the manager.
A fourth emerging variant – tokenised fund structures using on-chain custody – exists but is not yet standardised across institutional investors. We advise managers evaluating this model to treat it as a complement to, rather than a replacement for, a regulated off-chain custody arrangement until the applicable regulatory guidance matures.
What is the process for establishing compliant custody arrangements?
Establishing institutional-grade custody for a digital-asset fund involves a sequential set of decisions and confirmations, each of which affects the next. The steps below reflect the process we work through with fund clients at the formation stage.
Step one: confirm the regulatory perimeter. Before engaging a custodian, confirm which regulatory regime governs custody in the fund's domicile and in the jurisdictions where assets will be held. This means identifying whether custody is regulated as a standalone activity or as a component of a broader investment services licence in each relevant forum.
Step two: map the available custodian pool. Not all custodians are licensed in all domiciles, and some custodians will not serve funds below a defined AUM threshold. The pool of custodians willing and able to serve a digital-asset fund at formation – before it has demonstrated scale – is materially smaller than the pool available to an established operator.
Step three: negotiate the custody agreement. The custody agreement for a digital-asset fund differs from a traditional securities custody agreement in several respects: key management obligations, the treatment of hard forks and airdrops, staking revenue allocation, network upgrade events and the custodian's rights and obligations on an insolvency of the fund or the custodian itself. These provisions require careful drafting and should not be accepted on the custodian's standard form without review.
Step four: confirm AML and Travel Rule compliance. Under the Travel Rule (the obligation under FATF Recommendation 15 to pass originator and beneficiary data with a virtual-asset transfer), every transfer into and out of the fund's custody account generates a compliance obligation. The custody arrangement must specify how Travel Rule data is collected, transmitted and retained, and the fund's AML/KYC procedures must integrate with those of the custodian.
Step five: document for investor due diligence. Institutional investors will require a custody summary – a written description of the custody arrangement, the custodian's regulatory status, the segregation model and the insurance or indemnity coverage – as part of their subscription due diligence. Preparing this document in advance, with supporting regulatory confirmations, materially shortens the time to first close.
What are the most common mistakes fund managers make on custody?
In our cross-border practice, the custody errors we encounter most frequently fall into a small number of categories that are structurally predictable and preventable.
The most common error is selecting the fund domicile without confirming that a regulated custodian will accept the mandate. Some managers select a domicile for tax or operational reasons and only discover at the documentation stage that the available custodians in that jurisdiction will not serve a fund at the proposed AUM or with the proposed asset mix. The structural consequence – reconstituting the fund or seeking an exception – is costly and delays the fundraising timeline.
The second most common error is accepting the custodian's standard agreement without negotiating the digital-asset-specific provisions. Standard-form custody agreements are written for traditional securities and do not address the operational realities of digital assets: private key management, network fork events, staking and yield-generating activities, the treatment of on-chain governance rights and the custodian's liability for technical failure. A fund that accepts a standard agreement without amendment may find that its contractual protections are materially weaker than it assumed.
The third error is treating custody as an operational matter rather than a regulatory one. Custody of digital assets is a regulated activity. A manager who selects a technology provider that holds keys without the relevant licence is not in a custody arrangement at all in a regulatory sense – it is in an unregulated technology services arrangement that will not satisfy institutional due diligence and may expose the manager to regulatory liability in the fund's domicile.
A micro-matter illustrates the third point directly. In a recent matter involving a fund structured in a leading offshore domicile, an investment manager had engaged a technology-only key management provider at formation. The provider held the fund's private keys under a software-as-a-service agreement but was not a licensed custodian in any jurisdiction. When a prospective institutional allocator's counsel reviewed the structure ahead of a significant commitment, the arrangement was flagged as non-compliant, and the subscription was withheld pending restructuring. We were engaged to advise on the reconstitution, worked with allied counsel in the relevant domicile to identify a licensed custodian willing to assume the mandate on an accelerated timeline and drafted the replacement custody agreement to address the investor's specific due-diligence requirements. The fund achieved its first close within a matter of weeks of the restructuring completing.
If a prior application stalled or an investor commitment was withheld pending custody restructuring, a second read can surface the structural reason and the route forward. Contact OBOLUS at info@oboluslaw.com or message us via t.me/oboluslaw.
Which custody model fits which fund profile?
The right custody model depends on five variables: the fund's domicile, its target investor base, its asset mix, its trading strategy and its AUM at launch. The analysis below reflects the decision points we work through with clients.
Profile A – Formation-stage fund targeting regulated institutional investors. A fund at formation with a target investor base of pension funds, insurance companies or sovereign wealth vehicles requires a qualified custodian arrangement from day one. The regulated custodian must be licensed in the fund's domicile or in a jurisdiction recognised by the target investors. Timeline to custody arrangement: variable depending on custodian onboarding requirements, but managers should allow material lead time before the anticipated first-close date. Key risk: the available pool of custodians willing to onboard a new fund without demonstrated AUM is limited; early engagement is essential.
Profile B – Mid-sized fund with an active trading strategy. A fund employing a high-frequency or arbitrage strategy across multiple digital-asset exchanges will require a prime broker or sub-custodian structure that provides exchange connectivity alongside formal custody. The legal complexity of mapping the custodial chain and ensuring segregation at each tier is higher. Key risk: in an insolvency scenario, assets held at exchange level may not benefit from the same segregation protections as assets held at the top-level custodian; the custody agreement must address this explicitly.
Profile C – Larger established manager considering self-custody. A manager with sufficient scale to invest in institutional-grade HSM or MPC key management infrastructure may consider self-custody as a counterparty-risk management decision. This model requires supplementary legal opinion letters, third-party technology audits and, in many cases, a bespoke disclosure to investors. It is not a starting-point solution and should only be evaluated after the manager has confirmed that its target investor base will accept it.
Profile D – Tokenised or on-chain fund structure. A manager evaluating a tokenised fund structure – where fund interests are represented as on-chain tokens and asset management is conducted through smart contracts – faces a custody question that combines on-chain and off-chain elements. Until the applicable regulatory guidance in the relevant domicile matures to address this model explicitly, we advise maintaining a regulated off-chain custody arrangement for the fund's underlying assets alongside any on-chain fund mechanics.
How does the cross-border structure affect custody compliance?
A digital-asset fund rarely sits entirely within one regulatory perimeter. The fund vehicle, the manager, the custodian, the investors and the underlying assets may each be located in different jurisdictions, and each jurisdiction's requirements apply to the activities conducted within its perimeter.
The most common cross-border custody issue arises when the fund's assets are held on exchanges or in wallets in jurisdictions whose regulatory requirements differ from those of the fund's domicile. A Cayman fund holding assets on a Singapore-licensed exchange must ensure that the custody arrangement covers both the Cayman regulatory baseline and the MAS safeguarding requirements applicable to the Singapore exchange. Where those requirements are inconsistent, the more onerous standard generally prevails in practice.
The AML and Travel Rule dimension is particularly acute in cross-border structures. FATF Recommendation 15 has been implemented at different speeds and with different thresholds across the major jurisdictions. A transfer from the fund's custody account to an exchange in a jurisdiction with a lower Travel Rule threshold than the fund's domicile may trigger a compliance obligation that the fund's operational procedures do not currently capture. In our practice, we map Travel Rule exposure as part of the custody documentation process rather than leaving it to the fund's ongoing compliance function.
Banking sits alongside custody as a cross-border constraint. Institutional digital-asset funds frequently encounter difficulty opening fiat banking accounts in the fund's domicile, and the banking relationship often sits in a different jurisdiction from the custody arrangement. The legal interaction between the banking and custody arrangements – particularly on redemption, where fiat proceeds must move from the custody account through the banking account to investors – requires explicit contractual documentation across both relationships.
Allied counsel in the relevant jurisdiction is engaged for any matter that requires a regulatory opinion, a local law confirmation or a court application in a forum outside our primary practice perimeter. This applies to custody arrangements that span multiple regulatory regimes: a cross-border custody structure requires local-law confirmations in each relevant jurisdiction before the documentation is finalised.
Related at OBOLUS
- Funds and Investment Vehicles for Digital-Asset Businesses – the full practice overview covering structuring, domicile and manager licensing
- Fund Domicile Selection in Estonia – a detailed analysis of the Estonian fund domicile under the MiCA transition regime
- Custody Arrangements for Funds: Established Operators – the corresponding service page for funds with an existing track record seeking custody restructuring
FAQ
Where should a crypto fund be domiciled?
The right domicile depends on the fund's investor base, asset mix and redemption profile. Cayman remains the most common choice for funds targeting US-adjacent institutional investors. BVI suits smaller or leaner structures. ADGM and AIFC serve managers targeting Middle Eastern and Central Asian allocators. EU-regulated structures may suit a fund targeting European institutional capital under the MiCA and alternative investment fund regimes. A mismatch between domicile and investor base generates tax leakage and due-diligence friction that is costly to correct after formation.
Does a digital-asset fund manager need a licence?
In most flagship jurisdictions, yes. Managing a collective investment vehicle investing in digital assets is a regulated activity in the Cayman Islands, the BVI, Singapore, Abu Dhabi, Dubai and across the EU under the MiCA and alternative investment fund management regimes. The licence required – and the jurisdiction in which it must be held – depends on where the manager is based, where the fund is domiciled and where investors are located. Operating without the required authorisation exposes the manager to enforcement risk and may void the fund's contractual relationships.
How is custody arranged for a crypto fund?
Custody for a digital-asset fund is arranged through a regulated custodian licensed in the fund's domicile or in a jurisdiction recognised by the fund's investors. The process involves selecting a custodian from the available licensed pool, negotiating a custody agreement that addresses digital-asset-specific provisions (key management, fork events, staking, insolvency treatment) and integrating the custody arrangement with the fund's AML and Travel Rule compliance procedures. Institutional investors require a written custody summary as part of their subscription due diligence before committing capital.
OBOLUS is an independent digital-asset law boutique acting only for businesses. We advise exchanges, custodians, token issuers and funds on licensing across 70+ jurisdictions, on disputes and on-chain asset recovery across 25+ forums, and on the tax, banking and compliance that sit around them. Digital assets are the entirety of our practice, and we act only for businesses. We match domicile to investor base, asset mix and redemption profile – bringing the structural discipline that institutional due diligence demands. To discuss your fund's custody architecture, contact info@oboluslaw.com.
By Lydia Brennan, Tax & Structuring Analyst – specialising in digital-asset fund structuring, domicile selection and the tax and custody arrangements that institutional investors require.
This publication is general information about the law and does not constitute legal advice. It is not a substitute for advice tailored to your circumstances. OBOLUS accepts no liability for action taken or not taken on the basis of this material. For advice on your situation, contact info@oboluslaw.com.